Segregation of male fertile and sterile plants of Salvia miltiorrhiza (Sh-B) in backcross and testcross populations tested over three years.

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A-20, A-249 and A-107 were sterile and inbred lines of Salvia miltiorrhiza with different biological characteristics; BC1F1 represented F1 progeny with one backcross; BC2F2 represented F2 progeny with twice backcross; represented self pollination; A-20Sh-BA represented half of fertile plants obtained from sterile seeds after hybridization between A-20 × Sh-B; A-20Sh-BA was self pollination of A-20Sh-BA progeny.